This paper covers a description of the evolvement and of the technical details of a highly-integrated offshore oil and gas production system. The technical aspects of the specific oil and gas processing systems, which are located in the Danish sector of the North Sea, are the main areas covered by this paper. The intent of the original oil field establishment which is now some 11 years old, recent developments of other oil and gas fields, and a description of the offshore production capabilities for handling future fields, are presented herein. The aim is to show how significant offshore process integration of independent oil and gas fields has been achieved. process integration of independent oil and gas fields has been achieved
A 50 year Concession for exploration and recovery of oil and gas from the onshore and offshore continental shelf areas of Denmark was awarded in its entirety to the A P Moller group during the period 1962 - 1965. The Dansk Undergrunds Consortium ("DUC") was formed by A P Moller in 1962 and included the two oil companies Gulf and Shell. In 1965, Texaco and Chevron joined the DUC and in 1974 Gulf left the group. After various changes of interest and operatorship the present organization came about with, as far as the most important offshore area "A"-South West is concerned (see Figure 1), Dansk Boreselskab A/S (Danbor) as development and production operator and Chevron as exploration operator. Danbor is a wholly owned subsidiary of A P Moller. The percentage interests in area ‘A’ -South West are: Danbor 30%, Shell 40%, Texaco 15%, Chevron 15%.
The first offshore well was drilled in 1966 on the Anne structure and found oil traces. The second well on this structure, drilled the following year, was classified as an oil find but in not very significant quantities. Interestingly, the first Anne well was not only the first discovery of oil in the Danish offshore area but in the North Sea as a whole. After continual exploration, the Dan field was discovered in 1971, and was found to have commercial quantities of hydrocarbons. This was quickly developed to give Denmark's first oil production in mid 1972. Further details of the Dan field are given later.
The Gorm oil field was also discovered in 1971, and, after two appraisal wells were drilled, the field came into production in 1981. This was followed closely by an initial development of the Skjold oil field in 1982 resulting from a discovery in 1977.
At present, the Tyra gas field, discovered in 1968, is in an advanced stage of development with first production slated for mid 1984.
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